Add 72/21 and 27/10
1st number: 3 9/21, 2nd number: 2 7/10
72/21 + 27/10 is 429/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
72/21 = 72 × 10/21 × 10 = 720/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
27/10 = 27 × 21/10 × 21 = 567/210 - Add the two like fractions:
720/210 + 567/210 = 720 + 567/210 = 1287/210 - 1287/210 simplified gives 429/70
- So, 72/21 + 27/10 = 429/70
In mixed form: 69/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21+54/10 72/42+27/10 72/21+27/20 72/21+81/10 72/63+27/10 72/21+27/30 72/21+27/50 72/21+27/70